网页如何实现拼图滑块的验证码_纯js的实现

时间：2024-02-22 12:56:13

实现思路：

监听滑块的移动事件，获取它离左侧的距离，赋值给分离出来的验证模块就可以了，至于陷下去的模块，得到图片的大小，根据图片的长宽的一半随机赋值吧（因为这个模块一般都在右侧靠中间的位置）

这种滑动解锁应该是有两张图片，一张正常的，一张上面有解锁区域的（后端给），然后前端只用把用户释放鼠标后，滑动模块在图片上的xy轴传给后端，后端做成功与否的判断。

 

纯js的实现：

只是前端验证，不具备高安全性。

html代码：

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>滑动验证</title>
    <link rel="stylesheet" href="css/index.css">
</head>

<body>
    <div class="box">
        <div class="imgBox">
            <div class="verify"></div>
            <div class="verified"></div>
        </div>
        <div class="handle">
            <span class="swiper"></span>
            <span class="text">拖动滑块</span>
        </div>
        <div class="refreshBox">
            <span class="refresh">点击切换图片</span>
        </div>
    </div>
    <script src=\'js/jquery-3.1.1.min.js\'></script>
    <script src=\'js/index.js\'></script>
</body>

　　

css代码:

.box {
  width: 300px;
  padding: 20px;
  background-color: #fff;
  box-shadow: 2px 2px 8px 0 rgba(0, 0, 0, 0.4);
}

.imgBox {
  position: relative;
  width: 300px;
  overflow: hidden;
  box-shadow: 0 0 8px 0 rgba(0, 0, 0, 0.4);
}

.imgBox img {
  width: 100%;
}

.imgBox div {
  display: none;
}

.handle {
  display: flex;
  align-items: center;
  position: relative;
  height: 30px;
  border-radius: 20px;
  margin: 20px 0;
  padding: 4px 0 4px 70px;
  box-shadow: 0 0 20px 0 rgba(0, 0, 0, 0.2) inset;
  background: #f5f5f5;
  user-select: none;
}

.text {
  opacity: 1;
  transition: opacity 0.5s ease-in-out;
  color: #aaa;
}

.swiper {
  position: absolute;
  top: -10px;
  left: 0px;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background-color: pink;
  box-shadow: 2px 2px 6px 0 rgba(0, 0, 0, 0.2);
}

.verify {
  position: absolute;
  left: 10px;
  width: 38px;
  height: 38px;
  border-radius: 5px;
  background-repeat: no-repeat;
  background-attachment: scroll;
  background-size: 300px;
  box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.4), 0 0 10px 0 rgba(90, 90, 90, 0.4);
  z-index: 10;
}

.verified {
  position: absolute;
  width: 38px;
  height: 38px;
  border-radius: 5px;
  background-color: rgba(0, 0, 0, 0.1);
  box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.4) inset;
}

.refreshBox {
  border-top: 1px solid #ccc;
  padding: 15px 0 0 5px;
}

.refresh {
  color: #fff;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  padding: 8px 20px;
  border-radius: 20px;
  background-color: #555;
  box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.4);
  transition: all 0.5s ease-in-out;
}
.refresh.click {
  box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.4) inset;
}

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js代码：

var box = $(\'.box\'),
  imgBox = $(\'.imgBox\'),
  handle = $(\'.handle\'),
  swiper = $(\'.swiper\'),
  text = $(\'.text\'),
  verify = $(\'.verify\'),
  verified = $(\'.verified\'),
  refresh = $(\'.refresh\')

// 图片集合
var imgs = []
for (let i = 1; i < 17; i++) {
  imgs.push(\'\' + i + i)
}

$(function() {
  // 随机添加背景图
  refreshImg()

  refresh.click(function() {
    e = event || window.event
    e.stopPropagation()

    refreshImg()
    start()
  })

  refresh.mousedown(function() {
    $(this).addClass(\'click\')
  })
  refresh.mouseup(function() {
    $(this).removeClass(\'click\')
  })

  window.onload = start()
})

function start() {
  var verImg = document.getElementsByClassName(\'verImg\')[0]

  if (verImg) {
    verImg.onload = function() {
      // 获取图片高度
      var imgH = this.clientHeight
      // 随机生成坐标（图片框固定宽度为300px，高度不定）
      var verX = 150 * (1 + Math.random()) - 38,
        verY = imgH / 4 + Math.random() * imgH / 2

      // 用户移动滑块函数
      fnDown(verX, verY)
    }
  }
}

function fnDown(verX, verY) {
  swiper.mousedown(function() {
    e = event || window.event
    e.stopPropagation()

    // 30为模块宽度
    verify.css({
      display: \'block\',
      top: `${verY}px`,
      \'background-position\': `-${verX}px -${verY}px`
    })
    verified.css({ display: \'block\', left: `${verX}px`, top: `${verY}px` })
    // 获取鼠标到按钮的距离
    var disX = e.clientX - $(this).offset().left,
      disY = e.clientY - $(this).offset().top
    text.css(\'opacity\', \'0\')

    // 防止重复绑定触发多次
    box.unbind(\'mousemove\')
    box.unbind(\'mouseup\')

    // 移动
    box.bind(\'mousemove\', function() {
      e = event || window.event
      fnMove(e, disX, disY)
    })

    // 释放
    box.bind(\'mouseup\', function() {
      var stopL = verify.offset().left - 28
      // 误差在2px以内则算做成功
      if (Math.abs(stopL - verX) > 2) {
        alert(\'验证失败\')
      } else {
        alert(\'验证成功\')
      }
      // 解除绑定，并将滑动模块归位
      box.unbind(\'mousemove\')
      swiper.css(\'left\', \'0px\')
      verify.css(\'left\', \'10px\')
      text.css(\'opacity\', \'1\')
      box.unbind(\'mouseup\')
    })
  })
}

function fnMove(e, posX, posY) {
  // 这里的e是以鼠标为参考
  var l = e.clientX - posX - $(handle).offset().left,
    winW = $(handle).width() + 29
  // 限制拖动范围只能在handle中
  if (l < 0) {
    l = 0
  } else if (l > winW) {
    l = winW
  }

  swiper.css(\'left\', `${l}px`)
  verify.css(\'left\', `${l + 10}px`)
}

function refreshImg() {
  // 随机生成下标
  var index = Math.round(Math.random() * 15)
  var imgH = 0

  verify.hide()
  verified.hide()

  var verImg = $(\'.verImg\')
  if (verImg.length) {
    verImg.attr(\'src\', `imgs/${imgs[index]}.jpg`)
  } else {
    imgBox.prepend(`<img class=\'verImg\' src="imgs/${imgs[index]}.jpg" />`)
  }
  verify.css(\'background-image\', `url(\'imgs/${imgs[index]}.jpg\')`)
}

　　

 

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